Power boiler



June 1940- E. H. TAYLOR 2,203,370

POWER BOILER Filed June 25. 193B 2 Sheets-Sheet 2 F161 HGlY.

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Patented June 4, 19 40 I om'reo STATES PATENT OFFICE 2,203,370 POWER.BOILER Ernest H. Taylor, Strcudsburg, Pa., assignor to The InternationalBoiler Works 00., East Stroudsburg, Pa., a corporation of PennsylvaniaApplication June 25, 1938, Serial No. 215,788 2 Claims. (Cl. 122-140)This invention relates to boilers for generating adapted to be firedthrough a door opening 9 high pressure steam, of a type intended for usein its front end wall 2 near the top of the fire box more particularlyin power plants. I; while the products of combustion leave by way Inconnection with boilers of the kind referred of an opening II] in therear end wall 3 near the 5 to, I aim to secure a greater output of drysteam bottom and are exhausted through a connecting 5 per square footofheating surface than was posflue or chimney II. Extending longitudinallyof sible heretofore without the use of special or the lower part of thecombustion chamber I and additional super-heating means; to attain amaxconnecting the hollows of the end walls 2 and imum yield of dry steamwith a minimum con- 3 are water tubes I2 which slope downwardly sumptionof fuel; and to reduce the flue gas temsomewhat toward the front end ofthe boiler. A 10 perature to a minimum degree consistent with transversediaphragm I3 of heavy refractory magood draft conditions. terial setsapart a firebox I4 in the top of the These objectives I realize ashereinafter more combustion chamber I, said diaphragm extending fullydisclosed in a boiler wherein a continuous rearwardly from the frontwall 2 and terminating water jacket extends over the top and downopposhort of the rear wall 3 of the boiler as shown in 15 site sidewalls of its combustion chamber; wherein Fig. II. About midway of theheight of the lower a multiplicity of water tubes inclined somewhatsubdivision of the chamber occupied by the tubes in respect to thehorizontal, extend longitudinally I2, is a substantially horizontalbafiie It which of the combustion chamber beneath a diaphragm reachesforwardly from the rear wall 3 and terwhich sets apart a fire box in theupper portion minates short of the front wall 2. By virtue of 20 of saidchamber and connects the hollows of this construction, a devious courseis defined for opposite walls so that a ring circuit is estabthe heatedgas of combustion in the lower sublished for the water; wherein thegases of comdivision of the firebox I as indicated by the full busticnemanating from the fire box are caused line arrows in Fig. II, the gasesflowing between to follow a devious course,.with changed direcand alongthe tubes I2 throughout the length 25 ticn of flow between and along thewater pipes, of the latter in opposite directions before passing enrouteto a fiue outlet in one of the walls at into the flue II. In practice,the water is maina level below said pipes. tained approximately at thelevel shown at ll A further aim of my invention is to attain the in theupper arched hollow of the boiler, its cirabove advantages in a boilerwhich lends itself culation through the jacketing and tubing being 30 tomanufacture from a small number of inter-. as indicated by the dottedline arrows in Fig. II. fitting components fashioned from sheet metalWater is introduced into the boiler at the front secured one to anotherin such manner as to end near the bottom through a pipe I8, see Fig.form. strong, rigid hollow steam power unit III; and the generated steampasses out of the capable of withstanding high internal pressures. topof the boiler at the center through a pipe 35 Other objects andadvantages of my invention I9, see Figs. I and II. The boiler is alsoprovided will appear from the detailed description of the at the topwith a tapped opening 20 for connecattached drawings, whereof Fig. Iis aview, partly tion of a safety valve (not shown), and with a in plan andpartly in horizontal section, of a tapped opening 2i which may be usedfor in-.

power boiler conveniently embodying the present stallation of a steaminjector. The additional 40 improvements. tapped pipe openings shown at22 and 23 re- Fig. II is a central longitudinal sectional viewspectively at the top and at one side of the of the boiler drawn toalarger scale. boiler (Figs. I-III) are intended to be used for Fig. IIIshows the front or firing end of the connection of a water column. Thereis also boiler; and -a tapped opening for a fusible safety plug, which45 Fig. IV is a tranverse sectional view of the latter is shown at 24 inFig. II. In order that structure taken as indicated by the arrows IVIVthe exterior surfaces of the tubes I 2 may be in Fig. II. cleaned whenrequired from time to time an As herein shown, my improved power boileropening 25 is provided in the side wall l of the has a combustionchamber I with jacketed front boiler, said opening being normally closedby a 5 and rear end walls 2, 3, jacketed side walls 4, 5 removable panelor door 26 which is preferably and a transversely-arched jacketed roof6, the lined with refractory material after common prachollows of whichare all directly communicative, tice in the art. the bottom or floor 7of said box paved or lined In its construction, my improved boilercomwith heavy refractory material 8. The boiler is prises suitablyshaped and spaced inner and outer 5,5

2 head sheets 21, 28 and 29, 30 of steel (Fig. 11) which respectivepairs jointly form the hollow end walls 2 and 3; and suitably shaped andspaced enveloping sheets 3|, 32 likewise of steel, which jointly formthe hollow side walls 4, 5 and the arched top 6. As shown, continuousinwardly-directed marginal flanges 21a, 28a. and 29a, 30a extendingaround the sides and top edges of the outerand inner head sheets 21, 28and 29, 30 are overlapped by the side edges of the enveloping sheets 3!and 32. The water jacketing of the boiler is well reinforced by suitablyallocated stay bolts 33 certain of which serve to unite the sheets 21,29 and 3! at the regions of overlap; while rivets shown at 34 and 35serveto unite the sheets 28, 30 and 32 at the regions of overlap. Thearched portion of the outer enveloping sheet is additionally reinforcedby diagonal braces shown at 36.-

The hollow end walls 2 and 3 are closed at the bottom by filler bars 31and 38 respectively to which the sheets 21, 28 and 29, 30 arepermanently secured either by riveting or welding. The jacketings of theside walls 4 and 5 are similarly closed at the bottom by fillers 39 and40 respectively; and the four walls are joined at the bottom by a baseplate M which is secured by screw bolts 52 engaging upwardly into theseveral filler blocks, see Figs. II and IV. At the door openings 9 andH), the edge margins of the head sheets 21, 28 and 29, 30 are directedinwardly toward each other into: abutting relation as shown and theabutting edges welded together as conventionally indicated at 43, M toform water tight joints. The opening 25 for the door or panel 26 in theside wall 4 of the boiler is similarly formed as shown in Fig. IV, andthe inner abutting edges of the inwardly-directed margins likewisepermanently united by welding. The water tubes I2 are accessible forinternal cleaning or for removal when replacement becomes necessary,upon removing the screw plugs shown at from aligned openings in theouter head sheets 28 and 30 of the end walls 2 and 3.

From the foregoing it will be apparent that I have provided a highlyefficient power boiler embodying in its construction but a few preformedparts which lend themselves individually to economical manufacture, andwhich, when assembled, form a strong, rigid and compact unit capable ofresisting rupture or distortion under high pressures. Due to down draftand devious flow of the combustion gases between and along the length ofthe water tubes (which provide the greater part of the heating surfaceof the boiler) in the lower part of the firebox, most of the availableheat is employed to the best advantage and the temperature of the gasesreduced to a degree slightly above the dew point before being dischargedinto the flue. As a consequence I secure' a high output of dry steamwith minimum consumption of fuel, and without requiring the aid ofsuperheating tubes as ordinarily.

Having thus described my invention, I claim:

1. Apower boiler having a combustion chamber formed by a horizontal topwall, vertical side walls and vertical front and rear end walls; acontinuous water jacket extending over said top and down said verticalfront and rear end walls; a longitudinal diaphragm at an intermediatelevel forming the bottom of a firing chamber within the combustionchamber at the top, said diaphragm sloping upward slightly from thefront end wall and terminating short of the rear wall,

with provision of a connecting passage between the upper and lowersubdivisions of the com- F bustion chamber by the diaphragm; a seconddiaphragm below the first in parallel relation thereto but extendingfrom the rear end wall and terminating short of the front end wall; a

multiplicity of water tubes connecting the hol- T lows of the oppositeend walls, said tubes being inclined in parallel relation to thediaphragms and disposed, some above and others below the lowerdiaphragm; a firing opening in the front end wall above the upperdiaphragm; and a flue opening in the rear end wall beneath the lowerdiaphragm.

2. A power boiler according to claim 1, in

which the water jacketing also extends down n the side walls of theboiler.

ERNEST I-I. TAYLOR.

